Abstract
D-dot sensors meet the development trend towards the downsizing, automation and digitalization of voltage sensors and is one of research hotspots for new voltage sensors at present. The traditional voltage measurement system of D-dot sensors makes possible the reverse solving of wire potentials according to the computational principles of the electric field inverse problem by measuring electric field values beneath the transmission line. Nevertheless, as it is limited by the solving method of the electric field inverse problem, the D-dot sensor voltage measurement system is struggling with solving difficulties and poor accuracy. To solve these problems, this paper suggests introducing a Gaussian integral into the D-dot sensor voltage measurement system to accurately measure the voltage of transmission lines. Based on studies of D-dot sensors, a transmission line voltage measurement method based on Gaussian integrals is proposed and used for the simulation of the electric field of a 220 kV and a 20 kV transmission line. The feasibility of the introduction of the Gaussian integral to solve transmission line voltage was verified by the simulation results. Finally, the performance of the Gaussian integral was verified by an experiment using the transmission line voltage measurement platform. The experimental results demonstrated that the D-dot sensor measurement system based on a Gaussian integral achieves high accuracy and the relative error is lower than 0.5%.
Highlights
D-dot sensors can realize the downsizing, integration and low cost of design due to their simple structure
The voltage solving method using the electromagnetic field inverse problem has some application limitations, as it is limited by the numerical calculation theory and method of the electromagnetic field, as well as the application conditions of the computers involved, and the D-dot sensor voltage measurement system is still challenged by voltage solving difficulties and poor accuracy [7,8,9]
In order to further verify the accuracy of the D-dot sensor voltage measurement method for transmission lines based on the Gaussian integral method, it is convenient to test and verify the transmission lines based on the Gaussian integral method, it is convenient to test and verify the simulation results
Summary
D-dot sensors can realize the downsizing, integration and low cost of design due to their simple structure. The voltage solving method using the electromagnetic field inverse problem has some application limitations, as it is limited by the numerical calculation theory and method of the electromagnetic field, as well as the application conditions of the computers involved, and the D-dot sensor voltage measurement system is still challenged by voltage solving difficulties and poor accuracy [7,8,9] To solve these problems, an integral algorithm is introduced into the D-dot sensor voltage measurement system. The traditional D-dot sensor voltage measurement system reverse calculates transmission line potentials by measuring the space electric field using the electric field inverse problem-solving method [6]. The principle and structure of D-dot sensors are introduced, and the D-dot sensor voltage measurement method of the transmission line based on the Gaussian integral method is proposed. The research results may provide a new direction for the study and development of D-dot sensor transmission line voltage measurement methods
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